"""
Copyright (c) 2022 Huawei Technologies Co.,Ltd.

openGauss is licensed under Mulan PSL v2.
You can use this software according to the terms and conditions of the Mulan PSL v2.
You may obtain a copy of Mulan PSL v2 at:

          http://license.coscl.org.cn/MulanPSL2

THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
See the Mulan PSL v2 for more details.
"""
"""
Case Type   : DMS分布式锁
Case Name   : 函数获取锁、解锁、锁冲突操作
Create At   : 2023/4/21
Owner       : opentestcase033
Description :
    1.创建函数
    2.开启事务a，删除函数，不提交，事务b执行后h回退
    3.开启事务b，重命名函数
    4.清理环境
Expect:
    1.设置成功
    2.执行成功，获取锁
    3.等锁释放，事务a回退(解锁)，事务b执行成功
    4.成功
History     :
"""

import os
import time
import unittest

from testcase.utils.Logger import Logger
from testcase.utils.CommonSH import CommonSH
from testcase.utils.Constant import Constant
from testcase.utils.ComThread import ComThread


class DmsOck(unittest.TestCase):

    def setUp(self):
        self.log = Logger()
        self.log.info(f'-----{os.path.basename(__file__)} start-----')
        self.pri_sh = CommonSH('PrimaryDbUser')
        self.constant = Constant()
        self.func = 'f_dms_ock_0017'

    def test_dms_ock(self):
        text1 = '-----step1:创建函数;expect:成功-----'
        self.log.info(text1)
        create_func = f"""drop function if exists {self.func}();
        create function {self.func}(num1 integer, num2 integer) 
        return integer as
        begin
        return num1 + num2;
        end;"""
        create_func_res = self.pri_sh.execut_db_sql(create_func)
        self.log.info(create_func_res)
        self.assertIn(self.constant.CREATE_FUNCTION_SUCCESS_MSG,
                      create_func_res, f"执行失败:{text1}")

        text2 = '-----step2:开启事务a，删除函数，不提交，事务b执行后h回退;' \
                'expect:执行成功，获取锁-----'
        self.log.info(text2)
        sql1 = f"start transaction;" \
               f"drop function {self.func}();" \
               f"select pg_sleep(3);" \
               f"rollback;"
        session1 = ComThread(self.pri_sh.execut_db_sql, args=(sql1,))
        session1.setDaemon(True)
        session1.start()
        time.sleep(1)

        text3 = '-----step3:开启事务b，重命名函数;' \
                'expect:等锁释放，事务a回退(解锁)后，事务b执行成功-----'
        self.log.info(text3)
        sql2 = f'''begin;
        alter function {self.func}(integer, integer) 
        rename to new_{self.func};'''
        session2 = ComThread(self.pri_sh.execut_db_sql, args=(sql2,))
        session2.setDaemon(True)
        session2.start()
        session1.join(10)
        session2.join(10)
        result1 = session1.get_result()
        self.log.info(f'session1_results: {result1}')
        result2 = session2.get_result()
        self.log.info(f'session2_results: {result2}')
        self.assertIn(self.constant.START_TRANSACTION_SUCCESS_MSG,
                      result1, f"执行失败:{text2}")
        self.assertIn(self.constant.DROP_FUNCTION_SUCCESS_MSG, result1,
                      f"执行失败:{text2}")
        self.assertIn(self.constant.ROLLBACK_MSG, result1, f"执行失败: {text3}")
        self.assertIn(self.constant.ALTER_FUNCTION_SUCCESS_MSG, result2,
                      f"重命名函数失败:{text3}")

    def tearDown(self):
        text4 = '-----step4:清理环境 expect:成功-----'
        self.log.info(text4)
        drop_res = self.pri_sh.execut_db_sql(
            f"drop function if exists {self.func}() cascade;"
            f"drop function if exists new_{self.func}() cascade;")
        self.log.info(drop_res)
        self.assertEqual(
            drop_res.count(self.constant.DROP_FUNCTION_SUCCESS_MSG), 2,
            f"删除函数失败:{text4}")
        self.log.info(f'-----{os.path.basename(__file__)} end-----')
